Lithium Ion Polymer Battery - 3.7V 70mAh | TinyCircuits.com
Rechargeable 3.7V 2200mAh Lithium ion battery 3.7V Li ion cells for 11.1V 12V 24V Singing machine mobile DVD player|Rechargeable Batteries| - AliExpress
Amazon.com: Rechargeable Lithium Ion Battery Pack - VIDAR 3.7V 5200mAh High Capacity Li-ion Battery Pack with JST PH2.54/2P Plug-in(Customizable) for Electronics,Toys,Lighting,Equipment : Health & Household